October 29, 2026

@michaelokun

Could deep brain stimulation change not only brain circuits, but also the genes that help those circuits communicate? This may be an important next chapter in deep brain stimulation (DBS). Gene expression refers to how brain cells turn specific genes on or off to influence their function. Neuronal assemblies are groups of brain cells that fire together to process information. Haley Moore and colleagues describe in a new paper in Nature how electrical stimulation of human brain tissue can strengthen coordinated neuronal activity and activate specific genetic programs involved in synaptic plasticity. The implications for the future of DBS are exciting. Key points: - Electrical stimulation strengthened neuronal assemblies, increasing coordinated firing and changing how neurons participated in functional brain networks. - Stimulation produced cell-type-specific changes in gene expression, particularly in excitatory neurons, involving genes such as FOS, EGR1, BDNF and HOMER1 that are linked to neuronal activity and synaptic function. - By combining electrical recordings and single-cell genomic analyses, the researchers connected stimulation-induced changes in brain activity to molecular pathways and identified related signatures following stimulation in living human brains. My take: This study resonates deeply w/ me because it challenges us to think beyond the traditional view that DBS works simply by turning abnormal brain circuits on or off. What if stimulation is also changing the biological machinery that determines how brain cells communicate, reorganize and adapt? We have long suspected that plasticity contributes to DBS outcomes, however directly linking stimulation, neuronal assemblies and gene regulation in human tissue represents an important advance. Could we eventually use molecular signatures to select better targets, personalize stimulation parameters and potentially promote more durable therapeutic effects? This is especially relevant as we move toward adaptive DBS, where stimulation responds to changing brain activity. We should remember that this was primarily a mechanistic study of human temporal cortex, not a clinical trial.